Unable to run program

[splat1125]

I recently discovered this repository and have been attempting to run it, but am not entirely sure where to start. I've attempted to run raindraw_wrapper.m using MATLAB, but that just leads to an issue where the .rain file seems to not exist, not generate, or something else entirely. I'm a novice with MATLAB, though, so this might be entirely my fault...

[20-Sep-2023 12:41:19] Iteration 1 (10-49)
[20-Sep-2023 12:41:19]   Opening file...
[20-Sep-2023 12:41:19]   Reading file...
Error using fread
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in raindraw (line 12)
        t(:,:,4-i)=fread(f,dim([2,1]),'uint64');

Error in raindraw_wrapper (line 10)
raindraw(dir,iter,dim,[r;g;b],1);```

Additionally, I couldn't figure out exactly how to use any of the documentation included in the `README.md`. This might be because I couldn't figure out how to open the files and get it to work to begin with, but... Again, that's likely just me. Apologies for my unlearned-ness; I'm very interested in this program regardless of how little I can understand its machinations. 

Thanks in advance for the help.